# try:
#     a= float(input("请输入被除数:"))
#     b= float(input("请输入除数:"))
#     c = a / b
#     print("商为：" , c)
# except ZeroDivisionError:
#     print("除数不能为零")
# except ValueError:
#     print("被除数和除数应为数字类型")

# fileName = "birthday.txt"
# try:
#     file = open(fileName, "r")
# except FileNotFoundError:
#     print(fileName, "文件不存在")
# else:
#     print(fileName, "文件有", len(file.readlines()), "行")
#     file.close()

# fileName = "integer.txt"
# try:
#     file = open(fileName, "a")
#     data = int(input("请输入一个整数："))
#     file.write(str(data))
# except Exception as e:
#     print(e)
# finally:
#     print("关闭文件")
#     file.close()